A structure of the technological characteristics of mobile phone
Now technology is more and more complex structure, structure size smaller and smaller,
This puts forward new requirements to the shell material. 



PCBM positive PCBM opposite
 Ultra-thin requirements of mobile phone mainboard smaller, thinner,
Save electricity.

second， the characteristics of the ceramic material, advantage
Mechanical characteristics: compared with metal materials, ceramic elastic modulus, high hardness (1500 hv), high compressive strength, but the brittleness is big, the ability of resistance to crack propagation is very low.
Chemical properties, chemical properties of the ceramic is very stable, has good oxidation resistance and heat resistance, moreover ceramics of acid, alkali, salt and molten nonferrous metals have strong corrosion resistance, ageing will not occur.
Thermal performance: the ceramic material of high melting point (2000 ℃), red hardness can reach 1000 ℃; But the ceramic thermal expansion coefficient and coefficient of thermal conductivity small, inherit temperature rapidly changing ability is poor, in high temperature cracking when upheaval.
Performance: most of the ceramic is electrical insulators, with the development of science and technology, there are already exhibit a variety of electronic ceramics, such as semiconductor ceramic superconducting ceramics, piezoelectric ceramics, pottery and porcelain, magnetic, electric and optical ceramic, and so on.
Optical performance: ceramic materials have unique optical properties, can be used as a solid state laser, optical fiber, optical storage, etc., transparent ceramic can be used for high pressure sodium lamp tube, etc. (ferrite magnetic ceramic) in the recording tape, record, transformer core and large computer memory element has a broad future
 
Three, ceramic material application - nanometer ceramics 

Three, ceramic materials, nano ceramic antenna
On ceramic surface metallization, can be used in the chip inductor, LED packaging, semiconductor packaging and ceramic electronic circuit, the car through the technology such as electronic circuits can be attached on mobile phone ceramic plate NFC antenna, RFID antenna, wireless charging inductance coil, and other functions, in the case of do not take up extra space mobile phone new function. 
Three, ceramic material application - piezoelectric ceramic touch screen
Using piezoelectric ceramic mechanical - electrical energy conversion between principle of touch screen can be applied to the mobile phone, the reaction is more sensitive, more reliable. 

Three, ceramic material application - piezoelectric ceramic speaker
Use of piezoelectric ceramics to the speaker, smaller size, the thickness of 1 mm below, and reliance on resonant chamber volume is small 
Three, ceramic material application - pressure sensitive ceramic capacitors 

Use a pressure sensitive ceramics feature for capacitance and asked for traditional devices to develop in the direction of "micro", requirement: small volume, light weight, low energy consumption, high performance, easy to mass production, low cost, easy integration and more functional. 

Three, ceramic material application - other applications serial number function principle introduction The main purpose
1 electromagnetic shielding by using magnetic materials (such as ferrite) or conductive material (conductive metal layer) absorption of electromagnetic waves produced inside the phone or consume. To prevent the diseases caused by electromagnetic radiation damage head, etc.
2 mobile phone signal enhancement using left hand material properties (dielectric constant and magnetic permeability and negative), the electromagnetic signal attenuation after imported into the left hand materials into enhanced field, equivalent to amplify weak electromagnetic field was carried out, so as to enhance the sensitivity of the antenna is used to enhance the signal, prevent you can't get a wireless mobile phone electromagnetic wave signal to couldn't get through.
3 NFC near field communication work frequency 13.56 MHz, is in the radio frequency identification (RFID) and the Internet technology has evolved on the basis of the fusion of new technology, using the electromagnetic induction principle to read the chip contents so as to exchange data. Within 10 cm is mainly used in mobile data exchange, such as online games, or mobile wallet, used for small payments, or identification.
4 wireless charging
There are four ways, including electromagnetic induction method the most mature, its principle is to use the principle of electromagnetic induction, the sending and receiving end each have a coil, the sender coil electromagnetic signal connection cable power supply, the receiver coil induction send the electromagnetic signal to generate an electric current to electric equipment. Wireless charging for mobile phones and other intelligent equipment, save the cable winding trouble.
5 bone conduction using the electrostrictive piezoelectric materials and magnetostrictive principle, the audio signal is converted to mechanical vibration, the vibration source, sound can be used to the principle of conduction in the solid medium, the sound waves to bypass the external auditory canal and middle ear, directly to the inner ear hearing voices. Used for mobile phone answering a noisy environment, or the elderly, people with hearing impairment.
6 sensor integration increasing independent functional modules, such as gas sensors, can increase the gas detection test function. Such as formaldehyde, gas, CO, CO2 gas sensor, detects the dangerous environment.
7 medical function Deposits a layer of functional coating on ceramic plate, such as antiseptic coating, far-infrared radiation coating. Used for disinfection of medical function. 

About ceramic materials, especially the piezoelectric, such as pressure sensitive sensors, actuators and other related disciplines gradually formed a special technology subject and technology, but its variety, difficulty is big, there is few research done regarding the universal theory and technology. At home and abroad and some courses in the micro actuators.
 requirements from the "three highs" to more emphasis on "three small". High precision, high speed, high quality, ultra-micronization model.the, micro-nano miniaturization
 ceramics is a new kind of functional electronic materials with high intelligence, along with continuous research and improvement of material and technology, ceramic technology application more and more widely. Ceramic materials as machine, electricity, sound, light and heat sensitive materials, and communication technology in the sensor, transducer, nondestructive testing and other fields has obtained the widespread application, all countries in the world after the solid phase reaction of polycrystal. And through the dc polarization treatment has the high piezoelectric effect of ferroelectric ceramic collectively, is a kind of mechanical energy can be attaches great importance to the research and development of piezoelectric ceramic materials. With the development of high and new technology, the application of ceramic materials will be more and more wide. In addition to used in high-tech fields, it is more of eye service for people, in their daily lives to create a better life for people 
Five, reference
 [1]. Judy wang, yun-feng cao. New fiber material, ceramic fiber. 2012, 20 (1)
 [2]. Yang YiMin. New actuator and its application [M []. Beijing: mechanical industry press, 1998:45-49
 [3] afar. Functional ceramics and its application [M]. Beijing: chemical industry press, 2003:33-55
 [4]. Letter. Quan-lu li. The development and application of new type of piezoelectric materials. Silicate. 2008